Core barrel



Aug. a

o. M. CARTER CORE BARREL Filed Aug. 27, 1925 I l m l w h BWF w/ INVENTOR OscarM ga f/er W TNESSF B 526 m I ATTOR N EYS Patented Aug. 23, 1927.

UNlTED STATES OSCAR M. CARTER, OF HOUSTON, TEXAS.

CORE BARREL.

Application filed August 27, 1925. Serial No. 52,904.

This invention relates to an improvement in sampling or coring devices designed to contain a sample of the formation in the drilling of wells.

The object of the invention is to provide an improvement of this character wherein the coremay build up easily and without encountering any material resistance within the core barrel provided to form and house the same and yet it is securely held against displacement in the barrel while the tool is withdrawn from the well although readily removable when the tool has been brought to the surface of the ground.

A further object is to provide a coring or sampling device having these advantages and capacities and Which is adapted for use with a. collapsible rotary drill so that no especial equipment need be had to mount and operate the coring device constituting the present invention.

A still further object is to provide a device of this character which is of simple and durable construction, reliable and effective in operation and easy and comparatively inex ensive to manufacture and operate.

01: er objects and advantages reside in certain novel features of the construction, arrangement and combination of parts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawin s forming a part of this specification, an in which: v

Figure 1 is a fragmentary view in elevation showing a sampling device applied to a standard collapsible rotary drill,

Figure 2 is a view partly in vertical section and partly in elevation further illustrating the device shown in Figure 1, and

Fi re 3 is a view in transverse section on the line 3-3 of Figure 2.

Referring to the drawings, the numeral 1 designates generally the standard collapsible rotary drill which forms the subject-matter 5 of my co-pending application, Serial No.

573,153, to which application reference is had for a more complete disclosure of the drill proper.

The present invention provides an elongated core barrel 2 which is of cylindrical form externally but which has its inner periphery tapered in that the interior of the barrel is smaller at its lower end than at its upper end, the cross sectional area of the barrel gradually increasing from its lower end to its upper end. Referriu to Figs. 2 and 53, particularly of the drawn 5, 1 indicates the barrel or casing of a rill head. 1 indicates the internal sleeve of such drill head while the two nien'ihers 1 are cutters projecting from the drill head at an angle and being held therein by the screws 5 which fit into a notch in the side of the cutter as shown. The cutters are held and driven by the drill head by means of two taper slots cut vertically in the side of the easing, into which the cutters are fitted. Adjacent its upper end the barrel is formed with internal threads which are engaged with external threads on a nipple 3 which has integrally formed therewith an attaching plate 4, the attaching plate being secured to the cutter holders of the drill by bolts 5. The nipple 3 merges into the plate 4 at the juncture of the plate and nipple vents 6 are provided. A valve seat, designated generally at 7, and consisting of an externally threaded plug is engaged with internal threads provided within the lower end of the nipple 3. This valve seat 7 has a longitudinal bore or opening 8 around the upper end of which a machined recess 9 is formed to provide a seat for a ball valve 10. A cross pin 11 limits the upward displacement of the valve 10. At the lower end of the barrel 2 an annular cutter 12 is provided and has integrally formed therewith an upstanding and externally threaded attaching collar 14 which has threaded engagement with internal threads provided therefor within the forward end of the barrel.

In use the coring device is attached to the lower end of the drill and is lowered through the drill stem until the cutter 12 engages the formation to be sampled. The assembly is then rotated and the cutters 12 sever a portion of the formation and cause the same to pass up through the core barrel 2. The mud fluid in the core barrel is displaced up through the opening 8 in the valve seat through the nipple 3 and out through the vent 6, the ball valve 10 permitting this. In this same way the mud fluid passes through the coring device when the tool is being lowered. As the material making up the core passes through the cutter 12 into the barrel it encounters no material resistance and its passage into the barrel is facilitated by the upwardly enlargin formation of the interior thereof. T is same structural feature tends to prevent displacement of the core from the barrel when the tool is being raised and this action is further aided by the ball valve 10 which seats on the machined recess 9 of the valve seat to prevent the inflow of fluid and seal off the space above the core whereby should the core move downwardly it would tend to create a vacuum in the upper part of the barrel above the core which would, of course, hold the core in position. Only a few minutes are required to obtain a core and it has been found in practice that perfect cores may be obtained practically all of the time without failure.

1. In a sampling device, a core barrel having its exterior of cylindrical form and having its interior tapered downwardly from its upper to its' lower end, a cutter at the lower end of the barrel, an attaching plate having a nipple threaded into the upper end of the core barrel, the juncture of the nipple and the attaching plate being provided with a vent, a valve seat provided within the nipple and having an opening affording communication between the vent and the interior of the barrel, and a downwardly seating; ball valveco-operable with the valve seat.

2. A sampling, devicefor use with drills including a core barrel having cutting means at its forward end and a valve controlled outlet at its upper end, said barrel being internally tapered. and an attaching plate. OSCAR M. CARTER. 

